package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        // 创建购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 设置用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
        // 判断当前商品是否在购物车中
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size()==1){
            // 如果存在，数量+1
            shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
        else {
            // 不存在，添加到购物车，数量默认为1
            // 判断添加的是菜品还是套餐
            if(shoppingCart.getDishId()!=null){
                //添加的是菜品
                Dish dish = dishMapper.getById(shoppingCart.getDishId());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
            }
            else {
                // 添加的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        List<ShoppingCart> list = shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        shoppingCartMapper.clean(BaseContext.getCurrentId());
    }

    /**
     * 购物车-减操作
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        // 创建购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 设置用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
        // 获取当前商品对象
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size()==1){
            shoppingCart = list.get(0);
            int number = shoppingCart.getNumber();
            if (number==1){
                shoppingCartMapper.delete(shoppingCart);
           }
            else {
                shoppingCart.setNumber(number-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
